"ABC Products" - Arnold ~ DEM-742-0720 - Mower Mulching Blade 20 Inch Set (Replaces O.E. #742-0720 & #742-0500 Blade). MTD thatching mower blade Replaces O.E. #742-0720 & #742-0500 mower blade 20" Blade mower blade Tempered for an edge that stays sharp longer Designed for long-lasting performance and superior cutting